Apparatus for making tapering plastic forms.



G. P. PBMBERTON. APPARATUSFOR MAKING TAPERING PLASTIC FORMS.

AIPLIOATION FILED 00T. 21. 1909.

Patented Mar. 22, 1910.

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N` .vn M R R T EE T vp@ A N s .E

WITNESSES" ears Armar REIG.

GEORGE F. PEMBERTON, OF LINCOLN, CALIFORNIA.

APPARATUS FOR TAPERING PLASTIC FORMS.

Specification of Letters Patent.

Patented Mar. 22, 191e.

Application filed October 21, 1909. Serial No. 523,751.

that they may be telescoped one into the other.

It consists in the combination of parts and details of construct-ionwhich. will be more fully explained by reference to the aecompanyingdrawings, in which- Figure 1 is a front elevation of the invention. Fig.2 is a vertical section. Fig. 3 is a cross sect-ion on the line m-m Fig.2. vFig 4 is a diagrammatic view showing the in vention as applied. Fig.5 -is a plan of the cutting wheel.

My invention is especially designed vfor the manufacture of circular,elliptical, polygv onal, quadrilateral, or other tubes, which aretapered from end to end, and are especially designed for the ultimateformation of segmental tileswhich are made tapering, s o that they maybe telescoped or laid in over lapping series.

In the drawings, A is a clay cylinder such as is used in ordinaryclay-pressing machinery, and provided witha pressing piston 2 connectedwith asteam cylinder 8 in the usual manner. l

Secured to the annular flange on the lower end of the cylinder A, is aninwardly converging ring orsection 4, havingl its inner periphery at thetop coinciding with the inner surface oi the cylinder' A, and its innerperiphery at the bottom adapted to fit thesinner edge of a. hollowtapering shell 5.

The upper end of the shell 5 is provided with an annular flange (i, onthe upper face of which vis formed a ridge 7 adapted to coincide orregister with a corresponding groove or channel on the under edge of theconvergent ring 4, for the purpose of insuring an exact juncture of theinner surfaces of the members 4 and 5.

A movable ring 8 is mounted on the lshell 5 beneath the flange G, and isheld in place and supported by means of a collar E) secured to the shell5. Rigidly secured to the movable ring 8, are dogs or hooks 10 which areadapted to be engaged with lugs 11 on the section 4, so asl to securelyclamp and sustain the shell 5 in close contact with the section 4. Ahandle 12 is secured to the ring 8, by means of which the ring may bemoved from side to side so as to engage or disen' gage the dogs or hooks10 from the lugs 11.

Extending upwardlywithin the cylinder A is an inner cylinder 13 which issupported upon and connected with the converging ring 4. Legs 14 are.formed at intervals around the cylinder 13, and set in pockets in thering 4, and are secured therein by bolts 15. -The upper end of thecylinder 13 is closed by a head-or cap 16 threaded thereon.

A tubular shaft 17 connects with the cap 16 i and extends upward throughthe pressing piston 2, terminating at a point near the steam cylinder 3,as shown in Fig. The lower end of the-cylinder 13 is provided with aiiange or shoulder 18 on its inner periphery, and is tapered on itsouter surface to correspond with the inner surface of the section 4,thus forming a narrow converging annular passage 19 between thecylinder13 and the section 4.

2() is a tapered core, which 'forms the inner portion of the mold, andis tapered to correspond with the outer shell 5, and with a sufficientdistance between its outer surface and the inner surface of the shell.to allow the introduction of plastic material to make a product of thedesired thickness and shape. The upper end of the core 2O is closed, andfits within the inner cylinder 13., and is provided with a flange 21which is adapted to rest upon the shoulder 1.8 to limit the downwardmovement of the core. The lower end of the core 20 is designed to fitover an upwardly extending tapered pin 22 when in its lower-mostposition. The centering pin 22 is centrally mounted in the end of avertical shaft23 which is'secured to the lower end of the shell 5 bymeans of'a disk 24 and brackets 25.

A handle 26 is attached to a stem 27,

- which projects below the mold. The cutter consists of outer and innerrings 307-30, with wires 31 radially extending from one to the otheracross the lower opening of the mold. Thecutting wheel connects with thehandle 26, so that as the latter is moved side-v wise to release theclamp 29, the wheel 30 vmoves therewith around the pin 22,' the wires 3lsevering the material projecting 'below the mold.

The core 20 isdrawn up into the cylinder 13 by means of a' cable 32which passes through the shaft 17, and is wound around a drum 33 by ahand-wheel 34.

In operation, the materials of which the l tile or other products aret'o be formed, are introduced into the clay cylinder A, b low thepressing piston 2 in any suitable ma ner common to the art. Downwardmovement of the pressing piston v2,-forlces the plastic substancethrough the passage 19 into the space between the shell 5 and -core 20,the parts being in the position'shown in full lines in'Fig. 2; Continuedpressure fills the mold, which is indicated by the oozing of thematerial out through the bottom. The piston 2 is then stop ed, and thelever 26 moved .so as to une amp the core 20, and

I s remove the surplus material on the end of the mold as beforedescribed. The clamps 10 arethen released from the lugs 1l, by thchandle 12, which allows the shell 5 to dro downward with thecounterweighted sha t 23, as shown in dotted lines, whichgis operated byahand-wheel 35 in the usual manner. The core 20 is simultaneously drawnVupward into the cylinder 13 as before described, leaving the articlesuspended lby its own' adherent strength, from the mouth of 'the passagel9 to be readily removed and afterward dried, baked, and burned, in theusual manner for forming pottery ware. The mold in this case is shown ascircular in cross section, however it is obvious that any other formdesired can'be'employed, in which case the section 4 would converge froma circular inner periphery at its top, to such form at its bottom edgeas would correspond with the mold below.

As the tapering cast is designed to be separated or divided in halveslengthwise, 4to form tiles, proj ectin rid es 36 are formed uponthe-opposite si es o the interior of the louter shell as shown in Fig.These ridges form indentations in the material of such depth that thecomplete tubular casts may be readily separated.

esaeea Having thus described my invention, what c I claim and desire ltosecure by LcttersPat- .attached to the lower end of the cylinder, a

tapering mold shell removably connected with said section, an innercylinder concentric with the outerone, having a convergent lange formingwith the convergent section an annular passage to the mold shell, and atapering concentric core within the mold shell.

2. The combination in an apparatus for making plastic forms, of acompression cylinder and plunger, a convergent section having a flangeandmeans to secure it to the bottom flange of the cylinder', an innerconcentric cylinder with downwardly divergent legs, means to secure thelegs to the upper part of the convergent section, a tapering coresupported and dependent from the 'inner cylinder, and' a mold sh'elldetachably supported from the convergent section.

3. The combination in an apparatus for making plastic forms, of acompression cyl- -inder and plunger, an annular convergent sectionsecured tothe open lower end of the cylinder, an inner concentriccylinder having a convergent ange at the lower end, forming with theconvergent section, a directing channel, a tapering core suspended fromthe inner cylinder, a mold shell concentrically inclosing the core, anddisengaging locking devices uniting the shell to the convergentsection'.

4. The combination in an apparatus for making plastic forms, ofconcentric cylinders, and a compression plunger movable in the outerone, a convergent section dependent from the outer cylinder and atapering mold core from the inner one, a mold shell concentric with thecore, having a flange with an annular ridge, a corresponding groovedflange at the bottom of the convergent section with which the mold shellridge registers, interlocking lugs and. hooks upon the section and themold shell, and a lever by which they may be engaged or-disengaged. i

5. The combination in an apparatus for making plastic forms, ofconcentric cylinders and a compression plunger movable in the outercylinder, a convergent section fixed to and dependent from the outercylinder, a mold core having a iange slidable in the inner cylinder anda shoulder at the bottom of said cylinder upon which the core 'flangenormally rests, a'mold shell concen- -tric with the core, means fordetachably vconnecting it with the bottomof the con` vergent section, ahollow plunger rod, a flexible connection with the mold core, eX-tending upward through the rod, and means llO lange 'noJrmall-y rests,

lconnecting said shell with stein having a cani u pon its-upper ders anda compression plunger niovableinthe outer cylinder, a 'convergentsectionv fixed to and dependent from the outer cylinder, a lnoldcorehaving a flange slidable' in the inner cylinder, and a shoulder upon thebottom of said cylinder upon which the a mold shell con` for detachablycentric with the core, means the bottom of core to said closure,said'means including 'an upwardly extending tapered "pin .over

which vthe lower end of the core is fitted,`a, end'ancb eccentricto theaxis of the p'in, said caniv bev ing adapted'to engage to lock it inposition, and a lever by whichtlie stem andcani are ,tnrnablel th bottomof the core 7. The combination in an apparatus tor making plastic forms`ot concentric cylinders, a compression plunger movable in llie outercylinder, a convergent section lixed to the lower end of the outercylinder, a mold shell and concentric core dependent respectively -fromthe convergent shell,k and from the innercylinder, said .core beingvertically Within the cylinder, a locking cam by Wliicli `tlievlower endvof the core is 'secured to prevent its being forced np, a lever bywhich said cani is turnedto engage or disengage a horizontally turnablecutter adapt ed to trim the lower en`d 'a lever vbyvvhioh the cutter ismoved simul- -taneously `w`ith the movement of the cam.

y In testimony' whereof I have hereunto set my hand in the presence oftwo subscribing witnesses. j

GEORGE F. IEMBERT( )N. Witnesses:

J. E. `WYATT A, J. GLAnniNe.

movable of the form, and

